The typical asking rate per listing is in the $20's per square foot per year. The Houston Metro region is going through a an increase in rates. In the last 3 months, the median rate went up $1 per sqft per year. That's a 6% rise in rent.
In the last 90 days, 3098 listings have been listed, so you'll want to check back regularly for new listings. About 4% of the available leases in the Houston Metro are subleases, so you will probably have to focus your search on direct office leases. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,940 sqft. Most buildings in this market are approximately 2 floors. Most buildings in this area were built in 1983 and are Class B.